TERMIUM Plus^®

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A propulsive device that consists of a flat material (as aluminized plastic) designed to receive thrust from solar radiation pressure and that can be attached to a spacecraft.  2, fiche 2, Anglais, - solar%20sail

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This heliogyro solar sail is under consideration by NASA scientists for a 1968 Halley's Comet mission. Each sail blade may be over four miles long to capture propulsion energy from solar radiation.  3, fiche 2, Anglais, - solar%20sail

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Surface aménagée pour capter dans l'espace l'énergie solaire (nécessaire à la propulsion d'un véhicule spatial).  3, fiche 2, Français, - voile%20solaire

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On s'intéresse beaucoup à cette méthode actuellement aux États-Unis où les techniques de «voiles solaires» sont très à la mode à la NASA, et, singulièrement, pour les vols lointains.  3, fiche 2, Français, - voile%20solaire

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An interesting numerical technique (for the purpose of graphical characterization) is Halley’s method.  1, fiche 3, Anglais, - Halley%26rsquo%3Bs%20method

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... Halley's method is in a class of algorithms that begins with a guess. The iteration is supposed to lead to a better guess, and the process is repeated. Halley's method behaves like a comet torn between conflicting tugs of two nearby planets. In some cases it might be difficult to determine which of the two nearby planets a comet will collide with even though we know the gravity equations.  1, fiche 3, Anglais, - Halley%26rsquo%3Bs%20method

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The Unit's interests in dust and comets were combined when the Giotto mission to Halley's comet in 1986 provided the opportunity to measure the dust density and mass distribution by attaching acoustic sensors to the spacecraft's bumper shield. DIDSY(Dust Impact Detection System) was developed and built by the Unit.  2, fiche 4, Anglais, - dust%20impact%20detection%20system

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of short-period comets, 93% move direct round the sun [Halley's Comet is one of the few with retrograde motion].  1, fiche 5, Anglais, - retrograde%20motion

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dans les trois cas le mouvement s'effectuait dans le sens rétrograde, contraire à celui de la révolution des planètes.  1, fiche 5, Français, - mouvement%20en%20sens%20r%C3%A9trograde

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there are other giant planets, each with a family of comets. For example, Halley's comet belongs to Neptune's family of comets.  1, fiche 7, Anglais, - family%20of%20comets

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on a parlé aussi d'une famille de comètes dont la distance aphélie serait en rapport avec l'orbite de Saturne.  1, fiche 7, Français, - famille%20de%20com%C3%A8tes

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